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Proceedings Paper

Temporal pre-pulse generation in high-intensity CPA lasers from imperfect domain orientation in anisotropic crystals
Author(s): Josef Cupal; Thomas Spinka; Emily Sistrunk; Bedrich Rus; Constantin Haefner
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Paper Abstract

We present a study of the temporal pre-pulse contrast degradation of high focused intensity pulses produced in CPA laser systems due to imperfections in amplifier design, alignment of amplifier components, and crystal inhomogenity. Using a measurement technique we have developed, we demonstrate the presence of multiple crystal domains inside Ti:sapphire slabs with ≈10 cm diameter. The results of our numeric calculations show that crystalline c-axis orientation inhomogenity caused by these crystal domains can lead to generation of pre-pulses with relative contrast >10-10 within several picoseconds before the main pulse. In a multiple-slab amplifier head configuration sometimes used in high repetition rate systems, the misalignment of the amplifier slabs crystalline c-axes with respect to each other can lead to the generation of pre-pulses with relative contrast as high as 10-6, depending on the magnitude of misalignment.

Paper Details

Date Published: 26 April 2019
PDF: 10 pages
Proc. SPIE 11034, Short-pulse High-energy Lasers and Ultrafast Optical Technologies, 110340F (26 April 2019); doi: 10.1117/12.2524115
Show Author Affiliations
Josef Cupal, ELI Beamlines (Czech Republic)
Thomas Spinka, Lawrence Livermore National Lab. (United States)
Emily Sistrunk, Lawrence Livermore National Lab. (United States)
Bedrich Rus, ELI Beamlines (Czech Republic)
Constantin Haefner, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 11034:
Short-pulse High-energy Lasers and Ultrafast Optical Technologies
Pavel Bakule; Constantin L. Haefner, Editor(s)

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